Solve 1. 2x2 + 6x - 25 = 0

2. 3x2 + 9 = 0

3. x2- 8x - 48 = 0

4. x2 + 4x - 21 = 0
I need help solving all of these.

Will make ! for correct answer the dot plot below shows the number of toys 21 shops sold in an hour.is the median or the mean a better center for this data and why? a. median; because the data is not symmetric and there are outliersb. median; because the data is symmetric and there are no outliersc. mean; because the data is symmetric and there are no outliersd. mean; because the data is skewed and there are outliers